Swap two variables without using third variable !!

1. public class SwapTwoNumberWithoutThirdVariable {
2. public static void main(String[] args) {
3. int a = 10;
4. int b = 20;
5. 
   
6. a = a + b;
7. b = a - b;
8. a = a - b;
9. System.out.println("after swap value of a: " + a);
10. System.out.println("after swap value of b: " + b);
11. }
12. }

Output:

after swap value of a: 20

after swap value of b: 10